Machines



NITE TATES CHARLES E. TIBBLES, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE TIBBLES MANUFACTURING COMPANY, OF SAME PLACE.

TAKE-UP MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 328,541, dated October 20, 1885.

Application filed May 14, 1885. Scn'al No. 165,411. (ModeL) To whom it may concern.-

Be it known that I, CHARLES E. TIBBLES,

of Chicago, in the county of Cook and State of Illinois, have invented a new and Improved Take up Mechanism for sewing Machines; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in

WhiCl1- Figure 1 is an interior view of the head of the machine, with the presser-foot bar cut away and the take-up lever removed. Fig. 2 is a view of the reverse of the face-plate, showing the take-up lever attached. Fig. 3 is a View of the head of the machine, having the face-plate broken away and showing the take up lever connected with the operating mechanism.

The object of my invention is to balance the working parts of the machine and operate the take-up lever by a positive motion from an extension of the needle-bar rock-shaft in such a way that the cam will force the roller on the crank-arm of the takenp lever to hug the camface closely and avoid any rattling of parts or noise due to wear and consequent lost motion.

My invention consists in an extension on the needle-bar rockshaft head provided with a cam-opening, one side of which has a yield ing spring-pressure against the take-up leverwrist which travels in said cam and keeps the wrist always close against the workingface of the cam, as will be hereinafter fully set out,

5 and specifically pointed out in the claim.

In order that those skilled in the art may make and use my invention, I will proceed to describe the exact manner in which I have carried it out.

In thesaid drawings, Ais the head of the ma chine, and B is the needle-bar rock-shaft,p1'o- Vided with the arm D, through which to work the needle-bar, and an extension-piece, C, on the opposite side from the arm D. The arm 5 D and piece 0 may be integral, or the piece may be secured by a collar and set-screw as shown.

A cam-slot, C, is cut in piece C to operate the take-up lever, as hereinafter set out. The working-face of this slot is the face marked a, 0 and for successful operation and perfect action it is highly desirable that the pin or stud on the take-up lever which lies within the camslot shall hug the face a continuously. This I accomplish by means of a spring piece or arm, C, forming the other face, I), of the cam, and attached as follows: The lower end of piece C is slotted in its edge, as shown in dotted lines at d. Behind this slot the piece C is bored, as seen at c, to receive a coiled spring,whicl1 is 5 compressed in hole a, and has its outer end bearing against the lower end of piece C be low the pivot 0, which holds piece C in the slot d. The constant pressure of the spring in hole a against the lower end of piece C forces that portion of piece C forming face b toward face a, and contracts the width of the cam-slot, as seen in Fig. 1, in the absence of any obstacle in the cam-slot to prevent it.

up lever I, which is secured to the face-plate L, being inserted in cam-slot C, (see Fig. 3,) the spring pressure on arm C constantly presses the wrist and its anti-friction roller against the working-face a and prevents any lost motion due to wearing of the cam face, and consequently avoids rattling of the parts.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

The piece C, on the end of the needle-bar rock-shaft, and provided with a cam-slot, C, in combination with the pivoted piece C, means for securing a constant spring-pressure on piece C, and the take-up lever I, substantially as described.

CHARLES E. TIBBLES.

Witnesses:

F. D. ELLSWORTH, F. B. Evans.

The wrist h of the crank-arm H on the take- 70 

